Just seen turkisheconomy site and am intrigued by statement 7.9, namely
7.9. Does your social insurance scheme cover your health expenditures in Turkey?
If you reside in Turkey, your social insurance scheme can cover your health insurance expenditures in Turkey. Please contact the relevant organization in UK for the details.
Though I have not looked at that web site, you can get booklets regarding Social security agreement between U.K and Turkey from the Dpt. of work and Pensions www.dwp.gov.uk also from the Inland Revenue another booklet Social security Abroad. Should you move over to Turkey permanetly the only thing you can get is your State Pension which can be paid direct into your Turkish bank. Any other benefits you might have in this Country are not payable in Turkey!!